Don't take it personally.

They are grieving and the fact that you have what they desperately long for is hard to handle.

I haven't had IVF but my best friend has had 5 failed attempts and watched myself and her sister, and now her other sister and myself again, get pregnant. I struggled that she wasnt there for me as much as I would have liked, until I had my miscarriages. It isn't the same situation but it helped me understand where she was coming from.

She isn't punishing you, she is just distancing herself for a while to deal with her own world crumbling.

Give her time. And don't take it personally.